view tests/test-fetch.t @ 33289:abd7dedbaa36

sparse: vendor Facebook-developed extension

Facebook has developed an extension to enable "sparse" checkouts -
a working directory with a subset of files. This feature is a critical
component in enabling repositories to scale to infinite number of
files while retaining reasonable performance. It's worth noting
that sparse checkout is only one possible solution to this problem:
another is virtual filesystems that realize files on first access.
But given that virtual filesystems may not be accessible to all
users, sparse checkout is necessary as a fallback.

Per mailing list discussion at
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/095868.html
we want to add sparse checkout to the Mercurial distribution via
roughly the following mechanism:

1. Vendor extension as-is with minimal modifications (this patch)
2. Refactor extension so it is more clearly experimental and inline
   with Mercurial practices
3. Move code from extension into core where possible
4. Drop experimental labeling and/or move feature into core
   after sign-off from narrow clone feature owners

This commit essentially copies the sparse extension and tests
from revision 71e0a2aeca92a4078fe1b8c76e32c88ff1929737 of the
https://bitbucket.org/facebook/hg-experimental repository.

A list of modifications made as part of vendoring is as follows:

* "EXPERIMENTAL" added to module docstring
* Imports were changed to match Mercurial style conventions
* "testedwith" value was updated to core Mercurial special value and
  comment boilerplate was inserted
* A "clone_sparse" function was renamed to "clonesparse" to appease
  the style checker
* Paths to the sparse extension in tests reflect built-in location
* test-sparse-extensions.t was renamed to test-sparse-fsmonitor.t
  and references to "simplecache" were removed. The test always skips
  because it isn't trivial to run it given the way we currently run
  fsmonitor tests
* A double empty line was removed from test-sparse-profiles.t

There are aspects of the added code that are obviously not ideal.
The goal is to make a minimal number of modifications as part of
the vendoring to make it easier to track changes from the original
implementation. Refactoring will occur in subsequent patches.

#require serve

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "fetch=" >> $HGRCPATH

test fetch with default branches only

  $ hg init a
  $ echo a > a/a
  $ hg --cwd a commit -Ama
  adding a
  $ hg clone a b
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone a c
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b > a/b
  $ hg --cwd a commit -Amb
  adding b
  $ hg --cwd a parents -q
  1:d2ae7f538514

should pull one change

  $ hg --cwd b fetch ../a
  pulling from ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd b parents -q
  1:d2ae7f538514
  $ echo c > c/c
  $ hg --cwd c commit -Amc
  adding c
  $ hg clone c d
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone c e
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

We cannot use the default commit message if fetching from a local
repo, because the path of the repo will be included in the commit
message, making every commit appear different.
should merge c into a

  $ hg --cwd c fetch -d '0 0' -m 'automated merge' ../a
  pulling from ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  updating to 2:d2ae7f538514
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  merging with 1:d36c0562f908
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  new changeset 3:a323a0c43ec4 merges remote changes with local
  $ ls c
  a
  b
  c
  $ hg serve --cwd a -a localhost -p $HGPORT -d --pid-file=hg.pid
  $ cat a/hg.pid >> "$DAEMON_PIDS"

fetch over http, no auth
(this also tests that editor is invoked if '--edit' is specified)

  $ HGEDITOR=cat hg --cwd d fetch --edit http://localhost:$HGPORT/
  pulling from http://localhost:$HGPORT/
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  updating to 2:d2ae7f538514
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  merging with 1:d36c0562f908
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  Automated merge with http://localhost:$HGPORT/
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch merge
  HG: branch 'default'
  HG: changed c
  new changeset 3:* merges remote changes with local (glob)
  $ hg --cwd d tip --template '{desc}\n'
  Automated merge with http://localhost:$HGPORT/
  $ hg --cwd d status --rev 'tip^1' --rev tip
  A c
  $ hg --cwd d status --rev 'tip^2' --rev tip
  A b

fetch over http with auth (should be hidden in desc)
(this also tests that editor is not invoked if '--edit' is not
specified, even though commit message is not specified explicitly)

  $ HGEDITOR=cat hg --cwd e fetch http://user:password@localhost:$HGPORT/
  pulling from http://user:***@localhost:$HGPORT/
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  updating to 2:d2ae7f538514
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  merging with 1:d36c0562f908
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  new changeset 3:* merges remote changes with local (glob)
  $ hg --cwd e tip --template '{desc}\n'
  Automated merge with http://localhost:$HGPORT/
  $ hg clone a f
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone a g
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo f > f/f
  $ hg --cwd f ci -Amf
  adding f
  $ echo g > g/g
  $ hg --cwd g ci -Amg
  adding g
  $ hg clone -q f h
  $ hg clone -q g i

should merge f into g

  $ hg --cwd g fetch -d '0 0' --switch -m 'automated merge' ../f
  pulling from ../f
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  merging with 3:6343ca3eff20
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  new changeset 4:f7faa0b7d3c6 merges remote changes with local
  $ rm i/g

should abort, because i is modified

  $ hg --cwd i fetch ../h
  abort: uncommitted changes
  [255]

test fetch with named branches

  $ hg init nbase
  $ echo base > nbase/a
  $ hg -R nbase ci -Am base
  adding a
  $ hg -R nbase branch a
  marked working directory as branch a
  (branches are permanent and global, did you want a bookmark?)
  $ echo a > nbase/a
  $ hg -R nbase ci -m a
  $ hg -R nbase up -C 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R nbase branch b
  marked working directory as branch b
  $ echo b > nbase/b
  $ hg -R nbase ci -Am b
  adding b

pull in change on foreign branch

  $ hg clone nbase n1
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone nbase n2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n1 up -C a
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo aa > n1/a
  $ hg -R n1 ci -m a1
  $ hg -R n2 up -C b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n2 fetch -m 'merge' n1
  pulling from n1
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files

parent should be 2 (no automatic update)

  $ hg -R n2 parents --template '{rev}\n'
  2
  $ rm -fr n1 n2

pull in changes on both foreign and local branches

  $ hg clone nbase n1
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone nbase n2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n1 up -C a
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo aa > n1/a
  $ hg -R n1 ci -m a1
  $ hg -R n1 up -C b
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo bb > n1/b
  $ hg -R n1 ci -m b1
  $ hg -R n2 up -C b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n2 fetch -m 'merge' n1
  pulling from n1
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

parent should be 4 (fast forward)

  $ hg -R n2 parents --template '{rev}\n'
  4
  $ rm -fr n1 n2

pull changes on foreign (2 new heads) and local (1 new head) branches
with a local change

  $ hg clone nbase n1
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone nbase n2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n1 up -C a
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo a1 > n1/a
  $ hg -R n1 ci -m a1
  $ hg -R n1 up -C b
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo bb > n1/b
  $ hg -R n1 ci -m b1
  $ hg -R n1 up -C 1
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo a2 > n1/a
  $ hg -R n1 ci -m a2
  created new head
  $ hg -R n2 up -C b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo change >> n2/c
  $ hg -R n2 ci -A -m local
  adding c
  $ hg -R n2 fetch -d '0 0' -m 'merge' n1
  pulling from n1
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 2 files (+2 heads)
  updating to 5:3c4a837a864f
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  merging with 3:1267f84a9ea5
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  new changeset 7:2cf2a1261f21 merges remote changes with local

parent should be 7 (new merge changeset)

  $ hg -R n2 parents --template '{rev}\n'
  7
  $ rm -fr n1 n2

pull in changes on foreign (merge of local branch) and local (2 new
heads) with a local change

  $ hg clone nbase n1
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg clone nbase n2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n1 up -C a
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R n1 merge b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg -R n1 ci -m merge
  $ hg -R n1 up -C 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo c > n1/a
  $ hg -R n1 ci -m c
  $ hg -R n1 up -C 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo cc > n1/a
  $ hg -R n1 ci -m cc
  created new head
  $ hg -R n2 up -C b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo change >> n2/b
  $ hg -R n2 ci -A -m local
  $ hg -R n2 fetch -m 'merge' n1
  pulling from n1
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 1 files (+2 heads)
  not merging with 1 other new branch heads (use "hg heads ." and "hg merge" to merge them)
  [1]

parent should be 3 (fetch did not merge anything)

  $ hg -R n2 parents --template '{rev}\n'
  3
  $ rm -fr n1 n2

pull in change on different branch than dirstate

  $ hg init n1
  $ echo a > n1/a
  $ hg -R n1 ci -Am initial
  adding a
  $ hg clone n1 n2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b > n1/a
  $ hg -R n1 ci -m next
  $ hg -R n2 branch topic
  marked working directory as branch topic
  (branches are permanent and global, did you want a bookmark?)
  $ hg -R n2 fetch -m merge n1
  abort: working directory not at branch tip
  (use 'hg update' to check out branch tip)
  [255]

parent should be 0 (fetch did not update or merge anything)

  $ hg -R n2 parents --template '{rev}\n'
  0
  $ rm -fr n1 n2

test fetch with inactive branches

  $ hg init ib1
  $ echo a > ib1/a
  $ hg --cwd ib1 ci -Am base
  adding a
  $ hg --cwd ib1 branch second
  marked working directory as branch second
  (branches are permanent and global, did you want a bookmark?)
  $ echo b > ib1/b
  $ hg --cwd ib1 ci -Am onsecond
  adding b
  $ hg --cwd ib1 branch -f default
  marked working directory as branch default
  $ echo c > ib1/c
  $ hg --cwd ib1 ci -Am newdefault
  adding c
  created new head
  $ hg clone ib1 ib2
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

fetch should succeed

  $ hg --cwd ib2 fetch ../ib1
  pulling from ../ib1
  searching for changes
  no changes found
  $ rm -fr ib1 ib2

test issue1726

  $ hg init i1726r1
  $ echo a > i1726r1/a
  $ hg --cwd i1726r1 ci -Am base
  adding a
  $ hg clone i1726r1 i1726r2
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b > i1726r1/a
  $ hg --cwd i1726r1 ci -m second
  $ echo c > i1726r2/a
  $ hg --cwd i1726r2 ci -m third
  $ HGMERGE=true hg --cwd i1726r2 fetch ../i1726r1
  pulling from ../i1726r1
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  updating to 2:7837755a2789
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  merging with 1:d1f0c6c48ebd
  merging a
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  new changeset 3:* merges remote changes with local (glob)
  $ hg --cwd i1726r2 heads default --template '{rev}\n'
  3

test issue2047

  $ hg -q init i2047a
  $ cd i2047a
  $ echo a > a
  $ hg -q ci -Am a
  $ hg -q branch stable
  $ echo b > b
  $ hg -q ci -Am b
  $ cd ..
  $ hg -q clone -r 0 i2047a i2047b
  $ cd i2047b
  $ hg fetch ../i2047a
  pulling from ../i2047a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files

  $ cd ..